mcvsc 1.0.0

Closed until paid plans: storage only for ALLOWED_EMAILS; releases to the public repo

• API: unless ACCESS=open, only ALLOWED_EMAILS may use storage (403 with a
  clear message); anyone signed in can still see the account page, join the
  waitlist, or delete the account. Test added (22 total).
• Website and app hide "Create account" (signupOpen / Defaults.SignupOpen)
• Releases publish to Ayphil/MinecraftVSC_release with RELEASES_TOKEN (the
  workflow gives the empty repo a README first); all download links,
  Defaults.ReleasesUrl and the site's "View source" now point there

Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com

SHA-256 of mcvsc.exe: 4539f1ca6e5131dcbbb42842fe960b31aa3605dabcc5fb5c5a04d50419e5647e